Add Altera USB-Blaster SPI programmer

Adds support for the Altera USB-Blaster programming dongle in Active
Serial (AS) mode. Tested on both original product and a clone dongle.

Corresponding to flashrom svn r1658.

Signed-off-by: James Laird <jhl@mafipulation.org>
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/programmer.h b/programmer.h
index 03a71d8..b10f568 100644
--- a/programmer.h
+++ b/programmer.h
@@ -87,6 +87,9 @@
 #if CONFIG_LINUX_SPI == 1
 	PROGRAMMER_LINUX_SPI,
 #endif
+#if CONFIG_USBBLASTER_SPI == 1
+	PROGRAMMER_USBBLASTER_SPI,
+#endif
 	PROGRAMMER_INVALID /* This must always be the last entry. */
 };
 
@@ -431,6 +434,12 @@
 extern const struct dev_entry devs_ft2232spi[];
 #endif
 
+/* usbblaster_spi.c */
+#if CONFIG_USBBLASTER_SPI == 1
+int usbblaster_spi_init(void);
+extern const struct dev_entry devs_usbblasterspi[];
+#endif
+
 /* rayer_spi.c */
 #if CONFIG_RAYER_SPI == 1
 int rayer_spi_init(void);
@@ -509,6 +518,9 @@
 #if CONFIG_SERPROG == 1
 	SPI_CONTROLLER_SERPROG,
 #endif
+#if CONFIG_USBBLASTER_SPI == 1
+	SPI_CONTROLLER_USBBLASTER,
+#endif
 };
 
 #define MAX_DATA_UNSPECIFIED 0